Library /sys$common/syshlp/nclhelp.hlb set, x25_access, dte_class, strip DNIC  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: False                              Value: True or false

    Defines whether the first part of the NUA (the DNIC or DCC
    specified by the DNIC characteristic) should be stripped for
    outgoing calls, and whether the network strips the first portion
    of the NUA from addresses it presents to the DTE.